Friction shock-absorbing mechanism



Aug. 19 1924.y

JQ F. ocoNNoR FRICTION SHOCK ABSORBING MECHANISII Filed Ot. 4, 1920 mmw/M my Patented Aug. 19, 1924. y

narran s'i-a'rasfv PATENr etnica.,

OCONNOR, OF CHICAGO, ILLINOIS, ASSIGNIL BY` MESNE ASSIGNMENTS, y'I O W.H. MINER, INC.,'A CORPORATION 0F DELAWARE.

Farcrroiv SHOCK-assomme laneanimer/r;p.y

Application inea ,catcher 4.1926. seriai'nol 414,664.

To all whom t may concern.

Be it known that I, JOHN a citizen of the United States, residing atChicago, in the county of Cookand State of Illinois, have invented acertain new and useful Improvement in Friction Shock-AbsorbingMechanisms, of which the following is a full, clear, concise, and exactdescription, reference being had to the accompanying drawings, forming apart of this specification.

This invention relates to improvements in friction shock absorbingmechanisms.

One object of the invention is toprovide a friction shock absorbingmechanism for railway draft riggings 4wherein the kfriction shoes are sodesigned as to produce the wedging or expanding effect by action on eachother. v, y

Another object of the invention is to provide a friction shock absorbingmechanism having a vplurality of friction elements which possess andcombine the characteristics of both friction shoes proper and wedgesproper and wherein said elements are so formed and arranged as to beinherently expansible and contractible as a unit to therebyfacilitaterelease while at the same time permitting of high capacity.

In the drawing forming a part of this specification, Figure 1 is ahorizontal longitudinal ysectional view of a portion of a railway draftrigging showing my improvements in connection therewith, Figure 2 is avertical transverse sectional view corresponding substantially to theline 2-2 of Figure 1. And Figure 3 is an elevational view of the movablefriction elements and immediately associated parts.

In said drawing, 10-1() denote channel center or 'draft sills of arailway car to the inner faces of which are secured front stop lugs 11and rear stoplugs 12 of `'any desired type. bar is indicated at 13, thesame being connected to a hooded cast yoke 14 :by means of a coupler.key 15. The shock absorbing mechanismv proper, hereinafter described,is disposed within said yoke asis also a front follower 16. The yokevand parts therewithin are supported by any suitablemeans such as thedetachable saddle. plate 17.

The improved shock yabsorbing mechanism, as shown, comprises, broadly,acombined friction shell and spring cage casting F. OCoN'Non,

The rear portion of thedraw- A; a spring resistance Bga plurality ofcir-` cularly arranged annular segmental friction shoes C-C; an outercap D; an innerv cap or spring Lfollower E; and a retainer bolt i e M eIn carrying out 'my invention, the casting A is preferably madev withthe frictionshell proper 18 at the frontl endthereof and the springcage19 atythe krear end'.y The shell 1S is :of cylindrical form havinganinterior cylindricalfriction surface 120. The spring cage 19 is alsogenerally of cylindrical form and is provided with an integral rear wall20 Vwith lateral extensions 21 adapting the rear endy of the casting Ato act as the rear follower of the ymechanism with the stop lugs 12. y yn The ,spring B preferably consists of an outer. heavy coil 22 and aninner lighter nestedl coil 23. The retainer bolt F passes throughsuitable alined perforations in the kcags D and E andy in the rear wall.2O and, as will .beunderstood 'by those skilled f in the art, isyadapted tofmaintain the lparts is assembled relation and alsoto placethe y spring B under an initial compression, when desired.

yAs shown, Iemploy four friction elements C oflike constructiomtwo ofthem extending in one direction and the other g maant in cooperation twoin the' opposite direction and alternated as clearly indicated in Figure3. Each of said elements C, considered in section as in dicatedfinFigure'2, constitutes a portion of an kannulus the' exterior periphery`of which coincides with the shellfriction surface`120.l Each element`C. is formed with transverselyextending, parallel, ,innerA and cuteredges 24 and 25 kand with converging sideedges 26--26-t The said rsideedges 26, asshown in Figure 2, coincide with radially extending planespassing. through theaxis of, the friction shell. o f

The front 4or outer .cap I) is formed with a laterally extended annularAflange 27 and an inwardly extended cup or hollowboss ,28. Strengtheningandcentering longitudi- L1 t3 a lnaflly 'extending tapered. flanges 29,`are formed onsaid cap on ythe inner side of the flange'27and outersideof the. boss 28. y ,The flange 27 1s made of suiiicient diameter `so asto substantially equal the lnteriorvdiameter of fthefshell'flS and bearsupon the edges of thetwo outer friction elements@ asfshowny most`clearlyvin Figure 3.

The irnnercap or spring follower E is Aalso formed with a laterallyextended annular flange and a forwardly extended cup or hollow boss '31which forms a seat forv the forward end of the spring coil 23. Said capE is also provided with longitudinally extending, tapered, strengtheningribs '32 in the corners formed .between the out .pore tion and theflange 30. Said ribs 32 are so designed ias to `center ,said .cap withrespect to :thefricti-on .elements C, las will .be .clear from .1aninspection .of Figure l. The an nail-ar .flange 30 has bearing .against:the inner edges 24 ofv the remaining two friction elements .C as .shownin Figure l3 ,and .also provides `a Ybearing for the frontend of the iouter .heavy spring `coil 22.

In 4carrying out my invention, the ele- `ments .C will .be ,so .designedthat, when assembled as shown 'in Figure .3, with the outer Iperiphery.corresponding -to the friction surface ,120 of the shell, the twofriction elements C having .their wideends nearest the front follower16, will project beyond .the narrow vends .25 of the twolremainingfriction elements C .as shown in Figures l .and 3.V Obviously there willIbe a .corresponding yspace .as indica-ted .at 33 in Figure 3 ,between,the two forward friction elements and the .C21-p E. The elements C `arepreferably .made fof like construction and of relatively thin `sectionspring steel formed :and tempered, vor vother suitable material`commonly nnderstood as possessing inherent resiliency. i

The operation is as follows, assuming inward .or buffing movement of thedrawbar. `When the drawbar is forced inwardly .thus moving the frontfollower 16 corren spondingly, the cap `D will transmit the pressure tothe `two outermost friction elements C. Due to the wedge acting edges263-.-26 of A all .of the friction elements C, there .will lbe .animmediate expansion of the friction elements ,to increase thecircumference .of the unit or plug constituted by said elements. Theinnermost set .or ,group of friction elements C will .of course lo@ unitor plug itself anda .Correspending` eX- pansion of lthe friction shelldue to the radial pressure exerted thereagainst. As the friction unit orblock is forced inwardly .of .the shell, it is obvious `that friction isgenerated .between the elements C and the shell friction surface 120,the spring re- I have hereunto subscribed my name this lai-th s istancebeing several times multiplied because of the inner set of frictionelements C being directly resisted by the spring. Upon removal of :theactuating force or the load, the friction elements C will, initially, inthe release action, automatically fleX or bend to assume Vtheir initialor normal curvature, thus automatically decreasing the circumference ofthe friction unit or plug as an entirety and ,therefore permitting thespring ato Areact and V`project allof ,the friction elements outwardlyftotheir normal ,full released position.

l halve herein shown .and described what LI now .consider :the preferredmaIlIIerfof earryiilg out my invention, but 'l am aware thatvarionschanges and modifications may be made in the ,details of.construction land arrangement of partS Without departing from thespirit of the :invention and all such changes and modifications arecontemplated that come within the ,scope of the claims appended hereto.

I claim.:

l. In a friction shock absorbing mechanism, the combination with afriction shell and spring resistance.; of a plurality of flexible,resilient elements arranged to cooperate witli said shell as frictionshoes, said elements being arranged in two groups with those of onegroup alternated with y .I1S1I1 ,1the combination with a friction shellvhaving an interior cylindrical friction surface; of a springresistance.; and a plurality of flexible, resilient segmental wedgefriction shoes, said shoes being arranged in'an annular series havingengaging .edges eX- .tending radially tothe shell, and allof vsaid shoestogether constituting a vfriction plug cooperable with the shell, theshell being expansible and contracti'b'le.

3. In a friction shock absorbing mechanism, the combination with afriction shell having an interior cylindrical friction sur.- face; of .aplurality of annular, segmental, wedge friction shoes each formed of:steel and flexible radially; ,a follower interposed between one end ofsaid spring and the innerends of some of .said friction shoes; andvmeans for transmitting pressure yto the outer end .of the remainingfriction shoe.

In witness .that l claim the foregoinor day of Sept. i920. n

VTGLHN F. OGGNNOR.

. Witness @Arnia Galiano.

llO

